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Objective: Endovascular coil embolization has become an effective treatment modality for most intracranial aneurysms. However, complex aneurysms including large and giant aneurysms, fusiform shaped aneurysms, wide necked aneurysm, or small aneurysm that are unsuitable for coil embolization are still deterrent to be treated. Flow diversion is a novel concept that is applied in the treatment of these complex intracranial aneurysms. Method: We review the results and important features of 25 aneurysms in 24 patients who underwent endovascular treatment by using the pipeline flow-diverter embolization device. Result: At 6 month follow-up, all aneurysms (100%) showed total occlusion in our series. Only one patient who had giant vertebrobasilar aneurysm experienced major complication related to endovascular treatment. Discussion: We suggest that parent artery reconstruction via flow diversion with the PED is a valid and safe treatment modality. [ABSTRACT FROM AUTHOR]